First what I don’t like:This is really about the main application setup that is initially recommended with the unit – “Torque” not the unit (ATOTO AC-4450).I could see Torque is preinstalled on the ATOTO A6PF Android Double-DIN Car Stereo, but the instructions talk about installing it on your phone first, so I thought this was part of the setup/install piece – note you don’t need to as I realized after a few attempts.Then after trying to follow the instructions, you realize that it’s for an android phone only (I have a apple phone). The Apple store has so many different app’s named "Torque" from different software vendors 🙄.To be honest I didn’t try any other apps I just wanted to be able to have a dashboard with dials of several the major sensor outputs, other than the standard Speed, Rev’s etc. and when needed to run a diagnostic on any issues/errors.Next is minor, remember you must connect it twice – first with the head unit with Bluetooth.Then second with the app. It took me a while to click 😉. I believe this is because Torque the app can link in different ways on multiple difference devices.What I do like:It’s smaller than any other of my OBDII Diagnostic Scanners I have used.Slots in with no issues.After setup performs perfectly.The price is very reasonable.I would recommend this as a nice module add-on to the head Unit (ATOTO A6PF Double-DIN)I’ve only had the head Unit & ATOTO AC-4450 installed for 2 weeks, time will tell, if something drastically changes, I will update the review.

This thing tells you ALL KINDS of information about your car. Not only the miles you travel but also the fuel efficiency, and a bunch of other stuff, but most importantly, ERRORS. No more going "oh no, the light is on.. better take it to the shop.." lol no!! Just read the error codes! Saves you so much time and stress. You know what's wrong the second you press the button - no need to go to a shop.

This is basic, howeverAs opposed to an expensive obd scan toolThis does the job I need it to do

Haven't had any codes for my truck yet, but a friend had a check engine light and was able to determine his exact issue with this. Great for the price.

It works great when it's connected. I've had to re-pair it to the head unit a few times now. Not a huge deal, but kind of a pain. The LEDs on it also blink when it's on which I found distracting. I just threw some electrical tape over it and it's good to go.